I have an iPad WiFi+ 3g from AT&T but since I do not own a credit card I need to use the prepaid plan. I already have the cards.. I just don't know where to set it up.
I can't find any info on pre paid AT&T cards I would go back and return card or call AT&T and see what's up you might want to go with a pre paid visa card you can get those any where! Sorry for not being able to answer your question
I believe AT&T now offers a post pay plan as well, where they will bill you at the end of month. That probably does not require a credit card, just a check book.
You probably have to set that up directly with AT&T. I'm not sure.